Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c57b33ebbbb1d32…

MALICIOUS

PDF

173.9 KB Created: 2021-05-29 04:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3ed4be8e2adfb6c2c8b566c463808ca9 SHA-1: 21204e4b17b8e75d22bba6bc4ea2ad30f896f850 SHA-256: 8c57b33ebbbb1d321d9e546bde8719c630ab3d35c8b52a78724c7a05741e02e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=fingerprint+lock+screen+pro+apk+download PDF link annotation
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/wogamifit_dexadinivexigag_nasilana.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/2752565.pdfIn PDF document text
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/4336333.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/9718988.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/siseralitutomo.pdfIn PDF document text
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/rubaxitute.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/f30e0b8.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/e1f780ad698b7.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/borepavuvumujibisan.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/wolomix.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/xosinajojatojaf_bupugakaf_xexuketomu_vafowu.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/dobepol.pdfIn PDF document text
    • https://wajatajosow.weebly.com/uploads/1/3/4/4/134487766/pisexeminujav_babadoduzo_zogebuvagebo_lesolo.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/d1110224048a.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/7407063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b99f78-e396-4371-a572-6de8d778aed6/what_is_water_activity_in_microbiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6210bff-8389-4114-86c1-b4d1bfca0fcd/does_rumpelstiltskin_ever_find_his_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1009a0-c407-42f4-8aa2-35bee842a788/62174444683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31b381f-9acb-4700-99fe-3eddc0a244f5/lsu_football_workout_program.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AA8 16928 bytes
SHA-256: fc08e93c2e2cea2b5b65985733a6aafba88ff794431e79b7265e04641e81ac3a
font_01_sfnt_off0002614f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2614F 5352 bytes
SHA-256: cb80be5f485c253e951cbf63c22fb6e1eb73c67f70f09c4c5d61eec4e965b8b8
font_02_sfnt_off000273ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273AD 16712 bytes
SHA-256: 8ede02c2027ca02f8278e661aed3c877d0d559177cd09d9f70a9bf88ce08ac6c